Knowledge of the diets of New Zealand’s extinct moa (Aves: Dinornithiformes) comes from careful analysis of moa coprolites (fossilized poop) and gizzard contents. Moa coprolites and gizzard contents can be dissected and analyzed under the microscope or using DNA identification techniques to decipher what the birds ate. The contents can also be screened to see what seeds the birds may have dispersed.
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Source: Phys.org